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Jan. 27, 1931. J. R. GOIOT TWO-STROKE MOTOR Filed Jan. 31. 1928 w r a All? INLET FOR.

CARBURA'TTER.

- hwmwrog IlAl/S 7' FROM Pl/MP C YL INDER Patented Jan. 27, 1931 if 3 r u -ED TATE PAT NT orrlcs JEAN ROGER eoror, or slim/is,- rRA o i Two-ST OKE Moron Application filed January 31, 1Q28, S cria1 No. 250,883, and in France Febrharyfl, 1927.

'My invention relates to imorovementsjii1 front" of the distributor a compressed sub two stroke motors" Such motor-scare con- 'staiitially stationary gaseous mass which stituted diagrainmatically ljby a cylinder helps to keep the exhaust aperture airtight wherein a pistoii moves and whichis produring the very short timethe latter remains 5 vided alit-tle above the'position of the piston uncovered; this distributor Valve may. thus 55 at the nd of the driving stroke, with am. not rub againstthewalls ofits casing and aperture for introducing compressed ear play. may exist between the valve and the buretted a-ir, and-an exhaust aperture withsaid walls, which play varies according to' out a valve. The head of the cylinder the power ofthetwo stroke motor for which;

provided with aspark plug. the distributor is "built and'tothe intended .0

The pistoirhas in front of the inlet a'deuse ofztl'ie said motor, withoutany substantial fleeting wall. At the end ofthe driving loss of fresh gasesi occurring. This does stroke, the compressed burnt gases are exaway with all risks of gripping dueto the ted through aperture"whilst the comhigh temperature to which this part will 'be pr sed carburette'd air entering through brought by the exhaustgases; 7 a 5 aperture and led by the deflecting wait on- Due to this arrangement of acontrolled sures the sweeping ofthel burhtgasesand exhaust distributor, the two stroke'i'motor fill th li d v may be overfech This overfeed may-be pro Theoretically the two strokemotor should Vided by giving the two stroke" motor itself b very superior as to efficiency to a four superposed or stepped pistons or by using 70 stroke motorof same size as for the same a separate pump c pressorfor a rotary weight of metal itspow'erisdouble. But blade-orgear compressor or the like. 7

practically it is very inferior to the four The lower part of the piston bears an outer stroke machine. The chief reasons are the flange guided inacylinderprovided'with sucfollowing': I To ensure the complete fillingof tionand exhaust ports which may be formedthe cylinder with fresh gases, it is necessary by the same aperture, which cylinder form's to let part of the fresh gases escape with the with the piston an annular chamber whereliurnt gases. By reason of thehigh temperain a cooling fluid is alternatively sucked and turo resulting from the number ofexp losions driven "back. This device ensures the cooling :50 which for the same speed, is double that of a of the pistonand allows thus the suppression 8% four stroke motor, it is not possible] to use of the segments or other fluidtight parts of the high compressions which would further this piston. I p

the efliciency as they would cause early ex- This cooling fluid will be preferably fresh plosions; besides the heating of the piston pure air and this fresh air driven back and I causes the tluidtight segments to stick whereheated against the piston will be used pref 85 by the cylinder is more speedily Worn and it erably either for feeding the motor carburais necessary to frequently remove the cala-- tor or for overfeeding the motor .with commine from the said segments and from the pressed pure air. grooves of the piston. This cooling of the piston provides several The object of my invention is a two stroke advantages: The efficiency is increased by the motor which does not showthese drawbacks. fact that the fresh gases introduced are less This motor is provided with an exhaust "expanded by the contact of the piston. I'may distributor which does not need to be fiuiduse a higher degree of compression andovertight especially in the case where the GX- feed the motor without any risk of self ignihaust aperture is disposed as described heretion or detonations; the lubrication iswinr 5 inabove because in this case when the conproved, the wear minimized and the sticktrolled exhaust distributor closes, the fresh. ing of the segments suppressed. gases arriving against the said part with a It will be moreover of advantage to send certain speed are suddenly stopped and the carburetted air under pressure to the drivcaused to recoil and consequently form in ing cylinder through the piston which forms a cylinder open at its lower part and the top of which is provided with an aperture which at the end of the suction stroke passes in front of a recess in the wall of the cylinder proper; the piston is provided with a deflecting wall above this aperture.

By way of example I have described herein below and shown on appended drawing one form of execution of my two stroke motor.

The figure is a dia grammatical transversal cross section of a motor according to the in vention- A piston 8 may move in the cylinder 7. The cylinder is provided in the part uncovered by the piston at the end of its driving stroke with an exhaust 9 communicating with a distributor 10 the valve of which shows a channel 11. The piston 8 forms a hollow cylinder the bottom of which is open at 12 and communicates therethrough with the inside of the casing 13 secured to an extension 14; of the cylinder. The piston is provided at its upper end with an aperture 15 which at the .end of the driving stroke comes in front of a recess 16 provided in the driving cylinder- The top of the piston bears a deflecting wall 17. The cylinder 7 is provided with a spark plug 18. The piston 8 has at its lower part an outer flange 19 adapted to move in an outer cylinder formed by the extension 14 of the driving cylinder and provided at its upper end with a number of apertures 20, 21.

The working of this device is as follows 2' In the position illustrated on the drawing which corresponds to the end of the driving stroke. the valve of the distributorlO is supposed to he just open wide and the compressed burnt gases are exhausted along the path shown by the arrows 22. As soon as the piston arrives completely at the end of its stroke the valve 10 commences to close. Simultaneously the fresh carlniretted gases sent into the casing 13 pass through the hollow piston 8 along the path shown by the arrows 2 throu h the aperture 15 and the recess 16 and fill the cylinder 7 wherein they follow the path shown by the arrows 24, so that thev drive in front of them the last part of the burnt gases. The valve 10 closes completely when all the burnt gases are exhausted and the fresh carburetted gases arrive in front of aperture 9.

The flange 19 of the piston which acts as a piston in the cylinder 14, sucks and drives back at each stroke fresh air through the apertures 20,21. On the drawing the arrow illustrates the suction of fresh air through the aperture 20 and the corresponding check valve 27. The air which has been pumped in the pump cylinder 1d passes through aperture 21 into the duct and the carburettor 29 and the mixture thus formed passes through the throttle valve 28 into the crank case and thence tlnrongh the piston into the driving cylinder.

It is easy to understand a motor built as described provides all the advantages stated at the beginning of the specification.

What I claim is:

1. In a two stroke internal combustion motor cylinder adapted to be supercharged the combination of means for controlling the exhaust port of the cylinder, a pipe feeding air to the crank case, means for sucking cool air against the outside of the piston and forcing it into last mentioned pipe, :1 carburettor inserted in said pipe, means adapted to auto matically close said pipe and means connecting the crank case with the cylinder when the piston is towards the end of its outward stroke.

2. In a two stroke internal combustion motor cylinder adapted to be supercharged the combination of means for controlling the ex haust port of the cylinder, a pipe feeding air to the crank case, means for sucking cool air against the outside of the piston and forcing it into last mentioned pipe, a carburetter inserted in said pipe, an automatically controlled throttle valve mounted on the pipe between the carburettor and the crank case and means connecting the crank case with the cylinder when the piston is towards the end of its outward stroke.

3. In a two stroke internal combustion motor cylinder adapted to be supercharged the combination of means for controlling the ex h aust port of the cylinder, a pipe feeding air to the crank case, means for sucking cool air against the outside of the piston and forcing it into last mentioned pipe, a carburetter in serted in said pipe, an automatically controlled throttle valve mounted on the pipe between the carburetter and the crank case and means connecting the crank case with the cylinder through a port provided towards the inner ends of the piston and cooperating with a recess at the outer end of the cylinder.

4. In a two stroke internal combustion motor cylinder the combination of an auxiliary cylinder provided with an air inlet and disposed between the crank case and the cylinder, a flanged piston for the motor cylinder the flange of which acts as a piston for the auxiliary cylinder, a pipe wherethrough the auxiliary pump is adapted to force the compressed air into the crank case, a carburettor inserted in said pipe, an auton'iaticallv controlled throttle valve disposed in said pipe between the carburetter and the crank case and means for connecting the crank case with the motor cylinder through a port provided towards the inner end of the piston and cooperating with a recess at the outer end of the motor cylinder.

A two stroke internal combustion engine adapted to be supercharged comprising means for cooling the piston by a current of air for external scavenging, means for carburetting the said air after the scavenging,

piston reaches the end'of port formed in the piston when .the latter reaches the end of its course.

In testimony whereof I have afiixed no signature.

JEAN ROGER GOIOT.

adapted to be supercharged comprising means i'or sucking the scavenging air of the 7 piston and delivering this air into the crank case, means'for carburetting this air, means whereby the said air contained in the crank case is introduced into theflcylinder when 7 the piston reaches the end of its stroke.

7. A two stroke internal combustion engine adapted to be supercharged comprising means for sucking the scavenging air of the piston and deliveringthis air into the crank. case, a pipe through which the delivered air reaches the crankcase, a carburetter mounted on the said pipe, means for automatically closing this pipe," means whereby the carburetted air contained in the crank case is introduced into the cylinder whenthe piston reaches the end of its stroke.

8. A two stroke lnternal combustion englne adapted to be supercharged comprising means for sucking the scavenging air of the piston and dellverrng thisalr lnto the crank case, a pipe through which the delivered air reaches the crank case, a carburetter mounted on the said pipe, an automatically controlled valve mounted on this pipe between the carburett'er. and the crank case, means whereby. the carburetted air reaches the cylinder when the piston is at the end of its stroke.

9. A two stroke internal combustion englne adapted to be supercharged comprising means for sucking the scavenging air of the piston and delivering the said airinto the crank case, a pipe through which the delivcred air reaches the crank case, a carburetter mounted on the said pipe, an automati V cally controlled valve; mounted on this pipe between the carburetter and the crank case, a port formed in the. plston near the head thereof, an enlarged part formed at the base of the driving cylinder which uncoversthe port formed in the piston when the latter reaches the end of its stroke.

10. A two stroke lnternal combustlon engine adapted to be supercharged comprising an auxiliarycylinder provided between the V crank case and the driving cylinder, a flange formed on the base of the driving plston which constitutes the piston of the auxiliary cylinder, a suction port formed in the auxiliary cylinder, a pipe through which the delivered air reaches the crank case, a carburetter mounted on the said pipe, an automatically controlled valve mounted on this pipe between the carburetter and the crank case,

' a port formed in the piston nearjthe head thereof, an enlarged part formed at the base of the driving cylinder which uncovers the ion 

